Most calculator sites have a business model that works against the answer. You get four fields and a paywall, or a page that needs an account before it shows a number, or a result that arrives wrapped in three ad blocks. The question underneath never changed: how much, how many, how long?
1024Toolkit is my attempt at the opposite. It is a free collection of 45 browser tools for finance, health, engineering and development. Each tool answers one question well and runs entirely in your browser — no sign-up, no account, nothing uploaded, four languages.
What "one question well" means in practice
Take compound interest. The question is not "can you model monthly contributions with variable rates and a tax wrapper?" It is: what does £150 a month become at 6% over fifteen years? One number, one curve, two fields. Anything more belongs in a spreadsheet.
The same discipline shaped the rest:
- Position sizing — what should this trade be, given my account and my risk per trade?
- BMI — one weight, one height, one classification.
- Concrete volume — how many bags for 2.4 m³, and how much does that cost?
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Cron expressions — what does
0 3 * * 1actually run, and when is the next run? - Subnet maths — what does a /27 leave me with?
Why everything stays client-side
Every calculation runs in JavaScript in your own tab. There is no server to send numbers to, which means there is also no database to breach and no "free tier" to upgrade from. It also means the tools keep working when a train tunnel eats your signal — as long as the page is open, the maths works.
Who it is for
Honestly: anyone who re-googles the same conversion more than twice a week. Developers get cron, subnet and timestamp tools; investors get compound interest and position sizing; DIY gets concrete and paint coverage; the gym gets BMI and plate math.
The full set lives at 1024toolkit.com — one tab, 45 answers, no account.
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